Gwydion is a character from Welsh mythology, known primarily from the Mabinogion, a collection of medieval Welsh tales. He is often depicted as a magician and a trickster, possessing great wisdom and skill in the arts of illusion and transformation. Gwydion is a member of the House of Don and is the brother of Arianrhod, with whom he has a complex relationship. In the stories, Gwydion plays a significant role in the adventures of his family, particularly in the tale of Lleu Llaw Gyffes, his nephew. He is known for his cleverness and resourcefulness, often using his magical abilities to help his loved ones or to outsmart his enemies. Gwydion's character embodies themes of creativity, cunning, and the interplay between fate and free will.